JPS62267430A - Method and apparatus for threading in continuous heat treatment furnace for strip - Google Patents

Abstract

PURPOSE:To avert the injury of means for conveying a strip by progressing two pieces a pair of threading bars which are united to one body in parallel by a pair of driving mechanisms on both sides of the normal moving locus of the strip. CONSTITUTION:The strip 9 is ridden on rotated circular cylindrical hearth rolls 14 and is inserted in a roller hearth type continuous heat treatment furnace 1 for the strip from an inlet 6 thereof toward an outlet 7. Grooved wheels 22 are fixed to both side parts of the rolls 14 where the moving locus 12 of the strip 9 in the normal state is averted to form supporting parts 23 for supporting the threading bars 25 thereof. The driving mechanisms for progressing a pair of the bars 25 positioned on both sides in the upper part position of the moving locus 12 are constituted of such supporting parts 23. The bars 25 are progressed from the inlet 6 toward the outlet 7 by the driving mechanisms and the strip 9 connected thereto is progressed from the inlet 6 toward the outlet 7. The contact of the bars 25 with the means for conveying the strip 9 is thus obviated and the injury of the rolls 14 is prevented.

Description

[Detailed description of the invention] The present invention aims to solve the following problems.

(Industrial Application Field) The present invention relates to a threading method and a threading device in a continuous strip heat treatment furnace for inserting a strip into the furnace.

(Prior art) In the conventional threading method,
As shown in FIGS. 15 and 16, the threading bar 25F placed on the hearth roll 14F, which is a strip conveying means, is rotated, and the strip 9F connected to the rear end is moved by the movement of the threading bar 25F. There are various types of threading bars mentioned above, such as prismatic, I-shaped, and flat plate shapes, but in any case, the threading bar scratches the roll 14F, and the scratches are There was a problem in that the image was transferred from the roll 14F to the strip 9F, impairing the quality of the strip 9F.

(Problems to be Solved by the Invention) This invention provides a threading method in a continuous strip heat treatment furnace that eliminates the above conventional problems and allows the strip to be inserted into the furnace without damaging the strip conveying means. and a threading device.

The configuration of the present invention is as follows.

(Means for Solving the Problems) The present invention takes the measures as described in the claims above, and its effects are as follows.

(Operation) When the threading bar with connected strips is advanced from the inlet to the outlet by the drive mechanism,
The threading bar pulls the strip from the inlet to the outlet. In that case, since the drive mechanism described above is arranged on both sides of the strip conveyance locus,
The threading bar never comes into contact with the strip conveying means.

(Embodiments) The drawings showing the embodiments of the present application will be explained below. Figures 1 to 3 show roller hearth type strip series M.
2 In the drawing showing a processing furnace 1 (hereinafter referred to as the furnace 1), 2 is a heating furnace forming a heating chamber 3, and 4 is a cooling furnace forming a cooling chamber 5.

6 is an inlet, 7 is an outlet, and 8 is a communication port, which are formed so that the strip 9 can be inserted therethrough.

10 and 11 are a pair of sealing rolls, 12 is a locus of movement along which the strip 9 normally moves from the inlet 6 toward the exit lower, and 13 is a conveying means configured to convey the strip 9. In the conveying means 13, 14 is a cylindrical hearth roll on which the strip 9 is placed, and is rotatably supported by both side walls of the furnace body 2.4. 15 is a chain wheel fixed to one end of the roll 14; 16 is a chain suspended from each chain wheel 15;
A chain wheel 7 is fixed to the other end of the roll I4 on the most forward-moving side, and is connected to an electric motor 18. With these configurations, each roll 14 is rotated in the direction of the arrow. Reference numerals 19 and 19 denote plenum chambers that are disposed opposite to each other above and below the movement trajectory 12, and each opposing surface is provided with a large number of nozzles for blowing out gas, as is well known.

Next, 20 is a threading device, which is configured as follows. 22. 22 is a soap (/
(also referred to as a 1I vehicle), and are each formed to have a circumferential surface with a radius larger than the radius of the roll 14.

The bottom surface of the upwardly facing portion of the recesses a22a, 22a of the sheave 22.22 forms a support portion 23.23 above the top surface of the roll 14 for supporting a threading bar, which will be described later. Part 23, 23
constitute a driving mechanism for advancing a pair of threading bars located on both sides of the upper position of the movement locus 12. 2
4 is a threading frame for pulling the strip 9;
two mutually parallel threading bars 25.25;
It is composed of a plurality of connecting rods 26 that connect these threading bars 25 and 25 together. The threading bars 25, 25 are separated by a distance corresponding to the mutual spacing of the supports 23.23 of the sheaves 22.22 on both sides, and their lengths are such that the threading bars 25, 25 are separated by each sheave 22.22. The length is set to be sufficient to allow it to advance from the inlet 6 to the exit lower. 27 is the connection 2
This is the wire fixed to 6.

In the normal operating state of the above-described structure, the strip 9 is moved in the direction of arrow A along the trajectory 12, and the strip 9 is subjected to heat treatment of heating and cooling.

Next, when the strip 9 is cut in the above operating state, the threading operation is performed as follows.

That is, after connecting the wire 27 attached to the threading frame 24 to the tip of the strip 9, the threading frame 24 is introduced into the heating chamber 3 through the inlet 6, and the pair of threading bars 25, 25 are inserted into the hoop 22, 22. Support part 2
3.23 Loaded on board. In this state, the electric motor 18 is driven to rotate the sheaves 22, 22 in the direction of the arrow. By the rotation of the sheaves 22, 22, the threading frame 24 is conveyed through the heating chamber 3 and the cooling chamber 5 toward the exit lower, and as a result, the strip 9 is hammered into the threading bar 25 and is conveyed from the inlet 6 toward the exit lower. Moving. Thereafter, the threading frame 24 is taken out from the output lower and the wire 27 is removed from the strip 9, thereby completing threading.

Next, Figures 4 to 6 are floating type (pad type)
This shows an example of a furnace 1e, in which static pressure pads 28, 28 and 29, 29 are arranged in the heating chamber 3e and the cooling chamber 5e at the upper and lower sides with the movement locus 12e in between. . The shaft 21 for supporting the sheave in the threading device 20e is set at a position lower than the movement trajectory 12e so as not to contact the strip, and the sheave 22e, 2
The support portions 23e, 23e of the support portion 2e are set at the same height as the movement locus 12e, or at least the same height as the movement trajectory 12e.

In this example, the strip is a static pressure band 28°28
It is supported in a floating state by heated gas blown out from the pads 29 and cold air blown out from the static pressure pads 29 and 29, and transported in the same direction as in the previous embodiment.

It should be noted that parts that are considered to have the same or equivalent configuration as the previous version are given the same reference numerals as the previous version with the letter "e" and redundant explanations are omitted.

(Furthermore, in the next and subsequent editions, f, g, h, and i of the alpha head will be added in order based on the same idea, and redundant explanations will be omitted.) Figure 7 shows the static pressure pads 28f and 28f arranged in a staggered manner. This figure shows an example of an installed furnace. In such a furnace, the strip 9f is conveyed in a wave-like curved state.

8 to 1O show an example of a floating type (plenum chamber type) furnace 1g, in which a heating chamber 3g and a cooling chamber 5g include a plenum chamber 31. 31 and 32.32 are arranged.

The shafts 21g, 21g are supported by both side walls in a cantilevered manner, and are rotated by electric motors 118g, 18g, respectively. Generally, when a shaft is arranged in a penetrating manner, if the furnace width is wide, the shaft's own weight causes the shaft to flex, so the shaft diameter must be made very large, but in this example, even when the furnace width is wide, the shaft diameter is No need to make it bigger.

11 and 12 show another embodiment of a plenum chamber type furnace 1h, in which the lower plenum chamber 31
A recess 30 is provided on the upper surface of the shirt (shirt).
21h is located. By configuring as in this example, the shaft 21h can be disposed without passing through the plenum chamber 31h.

13 and 14 show an embodiment in a furnace 11 in which the strip is transferred in a catenary shape, and a heating chamber 31 and a cooling chamber 51 are provided with rolls 14i for supporting the strip 91.
In addition, sheaves 22i, 22i for supporting the threading bar are provided on both sides of the movement trajectory 12i.

(Effects of the Invention) As described above, in the present invention, when the strip 9 is cut during operation of the furnace, the threading bar 25 is advanced from the inlet 6 toward the exit lower, and connected thereto, the strip 9 is cut. Since it is advanced from the inlet 6 to the outlet lower, it has the advantage that even flexible strips that are difficult to advance on their own can be advanced from the inlet to the outlet and the furnace can be quickly restored to normal operating conditions.

Moreover, in the above case, the threading bar 25 passes on both sides of the movement trajectory 12 of the strip 9 or on both sides of the upper position, and does not directly utilize the strip conveying means. The threading bar 25 does not come into contact with the conveying means, which is effective in preventing damage to the conveying means, and even when the strip conveying means is a large number of rolls arranged side by side, a static pressure pad, or a plenum chamber. , the method of the present invention has practical effects.

Furthermore, in the apparatus of the present invention, since the roll 14 for moving the strip 9 is provided with a sheave 22, the sheave 22 is rotated by the drive of the roll 14, and the threading bar 25 is advanced by the sheave 22. This not only allows the threading bar 25 to be moved without damaging the roll 14 for strip movement, but also eliminates the need for an extra special configuration for rotating the sheave 22. .

Furthermore, in the apparatus of the present invention, sheaves for advancing the threading bar are disposed on both sides of the strip movement locus or on both sides of the upper position of the strip movement locus, so that the strip conveyance means is However, it has the advantage that it can be applied to any case, such as a large number of rolls arranged side by side, a static pressure pad, or a plenum chamber, and it can also be applied even when the width of the movement locus of the strip is very wide.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view of a continuous strip heat treatment furnace, FIG. 2 is a sectional view taken along the line ■-■, FIG. 3 is an enlarged sectional view taken along the line mm, and FIG. is a vertical sectional view of a furnace showing a different example, FIG. 5 is a sectional view taken along the ■-V line, and FIG.
7 is an explanatory diagram showing another different example, FIG. 8 is a longitudinal sectional view of the furnace showing another different example, and FIG. 9 is a sectional view taken along the line IX-IX. Fig. 10 is an enlarged cross-sectional view along line X-X, Fig. 11 is a vertical cross-sectional view of a furnace showing another different example, Fig. 12 is an enlarged cross-sectional view of X■-xIIvA, and Fig. 13 is a furnace showing another different example. The longitudinal cross-sectional view of FIG. 14 is XIV-XI.
15 is a vertical sectional view of a conventional furnace, and FIG. 16 is a sectional view taken along the line XVI-XVI. 6...Inlet, 7...Outlet, 9...Strip, 1
2...Movement trajectory, 14...Roll, 22...Soap, 25...Threading bar. Figure 15 Figure 16

Claims (3)

[Claims] (1) Inside a furnace for strip heat treatment having an inlet and an outlet, by advancing a threading bar from the inlet to the outlet, the strip connected to the threading bar is caused to follow the threading bar and exit from the inlet. In a threading method in a continuous heat treatment furnace in which a strip is advanced toward the outlet, on both sides of the normal movement trajectory of the strip inside the furnace or on both sides of the upper position of the normal movement trajectory of the strip,
A pair of drive mechanisms for advancing the threading bars are provided, and the pair of threading bars, which are integrally connected in parallel to each other, are advanced from the inlet to the outlet by the pair of drive mechanisms to allow the strip to pass through. A threading method in a strip continuous heat treatment furnace characterized by: (2) Inside the furnace for heat treatment of strips, which has an inlet and an outlet, a number of rolls are installed in parallel to move the strip from the inlet to the outlet. In the heat treatment furnace, sheaves for advancing threading bars are installed on both sides, avoiding the movement locus of the strip in the large number of rolls, while the two threading bars for pulling the strip 1. A threading device for a continuous strip heat treatment furnace, characterized in that the sheaves are connected to each other so as to be able to advance integrally at intervals corresponding to the intervals between the respective sheaves. (3) Inside a furnace for heat treatment of strips having an inlet and an outlet, a conveying means is arranged to determine the movement trajectory of the strip in the process of moving the strip from the inlet to the outlet. In a continuous strip heat treatment furnace, two sheaves for advancing the threading bar are arranged on both sides of the above-mentioned strip movement locus or on both sides of the upper position of the strip movement locus, and two sheaves for pulling the strip are provided. A threading device for a continuous strip heat treatment furnace, characterized in that the book threading bars are connected to each other so as to be able to advance integrally at intervals corresponding to the intervals between the respective sheaves on both sides.